html - 如何让内部div使用窗口滚动条？

Question

我想在我的页面中使用一个不占据整个屏幕的 div，当它的内容溢出时使用屏幕边缘的滚动条。我知道这听起来令人困惑，所以这里有一个例子:http://www.csszengarden.com/?cssfile=/202/202.css&page=1

我会发布代码，但我不确定从哪里开始。有人可以用 HTML 和 CSS 为我指出正确的方向吗？

Answer 1

一个技巧是覆盖一个或多个静态图像或框并固定它们的位置，然后调整整个页面的可滚动区域的大小，您的内部 <div> ，使其宽度适合覆盖区域暴露(即未覆盖)的“可视区域”(您可以使用填充来实现此目的)。

我做了一个 demo page来说明这一点。不过，根据我的建议，它确实涉及额外的标记；我敢打赌，使用 CSS Zen Garden 提供的相同基本标记可以使用更复杂的 CSS 来实现相同的效果，但我的回答只是另一种更简单的实现方式。

源代码如下。该代码段是可运行的，但由于原始尺寸没有修改，您将希望全屏查看它以查看任何有意义的操作。

body {
    margin: 0;
}

h1 {
    text-align: center;
}

#overlay div {
    position: fixed;
    width: 100%;
    height: 100%;
    background-color: gray;
}

/* The top and bottom "borders". */
#overlay .vert {
    height: 150px;
}

/* The left and right "borders". */
#overlay .hor {
    width: 300px;
}

/* Anchor the parts of your overlay boxes to the respective edges of the page. */
#overlay-top { top: 0; }
#overlay-bottom { bottom: 0; }
#overlay-left { left: 0; }
#overlay-right { right: 0; }

/* Your content has padding equal to the sizes of your overlay "borders". */
#content {
    padding: 150px 300px;
}

<!-- This acts as the overlay, or mask, of your content. -->
<div id="overlay">
    <div id="overlay-top" class="vert"></div>
    <div id="overlay-bottom" class="vert"></div>
    <div id="overlay-left" class="hor"></div>
    <div id="overlay-right" class="hor"></div>
</div>

<!-- The entire content of your page would go here. -->
<div id="content">
    <h1>Top of content</h1>
    <hr>
    <p>This is a demonstration of the effect of scrolling a small content area in a page using the window's scrollbars.</p>
    <p>It was created as an illustration of <a href="http://stackoverflow.com/a/5383466/106224">this CSS answer on Stack Overflow</a>.</p>
    <hr>
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    <p>Ne vim nemore vidisse rationibus. Id partem percipit quaerendum mel. Soleat graecis placerat cu eum, sed at dolores recteque. In sit consul appetere, cum exerci legere accommodare ad. Cum at legimus patrioque neglegentur.</p>
    <p>No alii aeque facilisis mea, his novum dissentias id. Ne his exerci feugait, mei te suas graeci iracundia. Ad paulo soluta vim, discere qualisque his eu. Ius ut fuisset offendit inciderint, mel putant impetus appellantur no. Sit ad integre officiis euripidis, libris necessitatibus at per. Tamquam insolens an duo, sed exerci electram ad, qui at doming inciderint adversarium.</p>
    <p>Cum ex ornatus accusam, vocent dolorem definiebas sit et, ut illud takimata mei. Eos ex sale brute, bonorum mediocrem an nam. Ei alienum quaestio maiestatis has, iriure vivendo cu est, pri harum periculis ex. Per ad idque populo omnesque, novum reformidans definitionem eu nec. Mel reque evertitur voluptatum ea, inani iuvaret sententiae et has.</p>
    <hr>
    <h1>Bottom of content</h1>
</div>